| First gastral tergite usually without standing hairs other than those on its posterior margin; second tergite with 2 or fewer standing hairs (Fig. 3.41a); in larger individuals the head is elongate with rounded posterolateral corners; SI usually greater than 142 |
First gastral tergite usually with standing hairs on the central part of its disc; second tergite with more than 5 hairs (Fig. 3.41b); in larger individuals the head is relatively wide, with angulate posterolateral corners; SI usually less than 142 |
